'\"
'\" Generated from file 'ftp\&.man' by tcllib/doctools with format 'nroff'
'\"
.TH "ftp" n 2\&.4\&.13 tcllib "ftp client"
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.BS
.SH NAME
ftp \- Client-side tcl implementation of the ftp protocol
.SH SYNOPSIS
package require \fBTcl  8\&.2\fR
.sp
package require \fBftp  ?2\&.4\&.13?\fR
.sp
\fB::ftp::Open\fR \fIserver\fR \fIuser\fR \fIpasswd\fR ?\fIoptions\fR?
.sp
\fB::ftp::Close\fR \fIhandle\fR
.sp
\fB::ftp::Cd\fR \fIhandle\fR \fIdirectory\fR
.sp
\fB::ftp::Pwd\fR \fIhandle\fR
.sp
\fB::ftp::Type\fR \fIhandle\fR ?\fBascii|binary|tenex\fR?
.sp
\fB::ftp::List\fR \fIhandle\fR ?\fIpattern\fR?
.sp
\fB::ftp::NList\fR \fIhandle\fR ?\fIdirectory\fR?
.sp
\fB::ftp::FileSize\fR \fIhandle\fR \fIfile\fR
.sp
\fB::ftp::ModTime\fR \fIhandle\fR \fIfile\fR
.sp
\fB::ftp::Delete\fR \fIhandle\fR \fIfile\fR
.sp
\fB::ftp::Rename\fR \fIhandle\fR \fIfrom\fR \fIto\fR
.sp
\fB::ftp::Put\fR \fIhandle\fR (\fIlocal\fR | -data \fIdata\fR | -channel \fIchan\fR) ?\fIremote\fR?
.sp
\fB::ftp::Append\fR \fIhandle\fR (\fIlocal\fR | -data \fIdata\fR | -channel \fIchan\fR) ?\fIremote\fR?
.sp
\fB::ftp::Get\fR \fIhandle\fR \fIremote\fR ?(\fIlocal\fR | -variable \fIvarname\fR | -channel \fIchan\fR)?
.sp
\fB::ftp::Reget\fR \fIhandle\fR \fIremote\fR ?\fIlocal\fR? ?\fIfrom\fR? ?\fIto\fR?
.sp
\fB::ftp::Newer\fR \fIhandle\fR \fIremote\fR ?\fIlocal\fR?
.sp
\fB::ftp::MkDir\fR \fIhandle\fR \fIdirectory\fR
.sp
\fB::ftp::RmDir\fR \fIhandle\fR \fIdirectory\fR
.sp
\fB::ftp::Quote\fR \fIhandle\fR \fIarg1\fR \fIarg2\fR \fI\&.\&.\&.\fR
.sp
\fB::ftp::DisplayMsg\fR \fIhandle\fR \fImsg\fR ?\fIstate\fR?
.sp
.BE
.SH DESCRIPTION
.PP
The ftp package provides the client side of the ftp protocol as
specified in RFC 959 (\fIhttp://www\&.rfc-editor\&.org/rfc/rfc959\&.txt\fR)\&.
The package implements both active (default) and passive ftp sessions\&.
.PP
A new ftp session is started with the \fB::ftp::Open\fR command\&. To
shutdown an existing ftp session use \fB::ftp::Close\fR\&. All other
commands are restricted to usage in an an open ftp session\&. They will
generate errors if they are used out of context\&.  The ftp package
includes file and directory manipulating commands for remote sites\&. To
perform the same operations on the local site use commands built into
the core, like \fBcd\fR or \fBfile\fR\&.
.PP
The output of the package is controlled by two state variables,
\fB::ftp::VERBOSE\fR and \fB::ftp::DEBUG\fR\&. Setting
\fB::ftp::VERBOSE\fR to "1" forces the package to show all responses
from a remote server\&. The default value is "0"\&. Setting
\fB::ftp::DEBUG\fR to "1" enables debugging and forces the package to
show all return codes, states, state changes and "real" ftp
commands\&. The default value is "0"\&.
.PP
The command \fB::ftp::DisplayMsg\fR is used to show the different
messages from the ftp session\&. The setting of \fB::ftp::VERBOSE\fR
determines if this command is called or not\&. The current
implementation of the command uses the \fBlog\fR package of tcllib
to write the messages to their final destination\&. This means that the
behaviour of \fB::ftp::DisplayMsg\fR can be customized without
changing its implementation\&. For more radical changes overwriting its
implementation by the application is of course still possible\&. Note
that the default implementation honors the option \fB-output\fR to
\fB::ftp::Open\fR for a session specific log command\&.
.PP
\fICaution\fR: The default implementation logs error messages like
all other messages\&. If this behaviour is changed to throwing an error
instead all commands in the API will change their behaviour too\&. In
such a case they will not return a failure code as described below but
pass the thrown error to their caller\&.
.SH API
.TP
\fB::ftp::Open\fR \fIserver\fR \fIuser\fR \fIpasswd\fR ?\fIoptions\fR?
This command is used to start a FTP session by establishing a control
connection to the FTP server\&. The defaults are used for any option not
specified by the caller\&.
.sp
The command takes a host name \fIserver\fR, a user name \fIuser\fR and
a password \fIpassword\fR as its parameters and returns a session
handle that is an integer number greater than or equal to "0", if the
connection is successfully established\&. Otherwise it returns "-1"\&.
The \fIserver\fR parameter must be the name or internet address (in
dotted decimal notation) of the ftp server to connect to\&. The
\fIuser\fR and \fIpasswd\fR parameters must contain a valid user name
and password to complete the login process\&.
.sp
The options overwrite some default values or set special abilities:
.RS
.TP
\fB-blocksize\fR \fIsize\fR
The blocksize is used during data transfer\&. At most \fIsize\fR bytes
are transfered at once\&. The default value for this option is 4096\&.
The package will evaluate the \fB-progress callback\fR for the
session after the transfer of each block\&.
.TP
\fB-timeout\fR \fIseconds\fR
If \fIseconds\fR is non-zero, then \fB::ftp::Open\fR sets up a timeout
which will occur after the specified number of seconds\&. The default
value is 600\&.
.TP
\fB-port\fR \fInumber\fR
The port \fInumber\fR specifies an alternative remote port on the ftp
server on which the ftp service resides\&. Most ftp services listen for
connection requests on the default port 21\&. Sometimes, usually for
security reasons, port numbers other than 21 are used for ftp
connections\&.
.TP
\fB-mode\fR \fImode\fR
The transfer \fImode\fR option determines if a file transfer occurs in
\fBactive\fR or \fBpassive\fR mode\&. In passive mode the client
will ask the ftp server to listen on a data port and wait for the
connection rather than to initiate the process by itself when a data
transfer request comes in\&. Passive mode is normally a requirement when
accessing sites via a firewall\&. The default mode is \fBactive\fR\&.
.TP
\fB-progress\fR \fIcallback\fR
This \fIcallback\fR is evaluated whenever a block of data was
transfered\&. See the option \fB-blocksize\fR for how to specify the
size of the transfered blocks\&.
.sp
When evaluating the \fIcallback\fR one argument is appended to the
callback script, the current accumulated number of bytes transferred
so far\&.
.TP
\fB-command\fR \fIcallback\fR
Specifying this option places the connection into asynchronous
mode\&. The \fIcallback\fR is evaluated after the completion of any
operation\&. When an operation is running no further operations must be
started until a callback has been received for the currently executing
operation\&.
.sp
When evaluating the \fIcallback\fR several arguments are appended to
the callback script, namely the keyword of the operation that has
completed and any additional arguments specific to the operation\&.  If
an error occurred during the execution of the operation the callback is
given the keyword \fBerror\fR\&.
.TP
\fB-output\fR \fIcallback\fR
This option has no default\&. If it is set the default implementation of
\fB::ftp::DisplayMsg\fR will use its value as command prefix to log
all internal messages\&. The callback will have three arguments appended
to it before evaluation, the id of the session, the message itself,
and the connection state, in this order\&.
.RE
.TP
\fB::ftp::Close\fR \fIhandle\fR
This command terminates the specified ftp session\&. If no file transfer
is in progress, the server will close the control connection
immediately\&. If a file transfer is in progress however, the control
connection will remain open until the transfers completes\&. When that
happens the server will write the result response for the transfer to
it and close the connection afterward\&.
.TP
\fB::ftp::Cd\fR \fIhandle\fR \fIdirectory\fR
This command changes the current working directory on the ftp server
to a specified target \fIdirectory\fR\&.  The command returns 1 if the
current working directory was successfully changed to the specified
directory or 0 if it fails\&.  The target directory can be
.RS
.IP \(bu
a subdirectory of the current directory,
.IP \(bu
Two dots, \fB\&.\&.\fR  (as an indicator for the parent directory of
the current directory)
.IP \(bu
or a fully qualified path to a new working directory\&.
.RE
.TP
\fB::ftp::Pwd\fR \fIhandle\fR
This command returns the complete path of the current working
directory on the ftp server, or an empty string in case of an error\&.
.TP
\fB::ftp::Type\fR \fIhandle\fR ?\fBascii|binary|tenex\fR?
This command sets the ftp file transfer type to either \fBascii\fR,
\fBbinary\fR, or \fBtenex\fR\&. The command always returns the
currently set type\&. If called without type no change is made\&.
.sp
Currently only \fBascii\fR and \fBbinary\fR types are
supported\&. There is some early (alpha) support for Tenex mode\&. The
type \fBascii\fR is normally used to convert text files into a
format suitable for text editors on the platform of the destination
machine\&. This mainly affects end-of-line markers\&. The type
\fBbinary\fR on the other hand allows the undisturbed transfer of
non-text files, such as compressed files, images and executables\&.
.TP
\fB::ftp::List\fR \fIhandle\fR ?\fIpattern\fR?
This command returns a human-readable list of files\&.  Wildcard
expressions such as "\fI*\&.tcl\fR" are allowed\&.  If \fIpattern\fR
refers to a specific directory, then the contents of that directory
are returned\&.  If the \fIpattern\fR is not a fully-qualified path
name, the command lists entries relative to the current remote
directory\&.  If no \fIpattern\fR is specified, the contents of the
current remote directory is returned\&.
.sp
The listing includes any system-dependent information that the server
chooses to include\&. For example most UNIX systems produce output from
the command \fBls -l\fR\&. The command returns the retrieved
information as a tcl list with one item per entry\&. Empty lines and
UNIX's "total" lines are ignored and not included in the result as
reported by this command\&.
.sp
If the command fails an empty list is returned\&.
.TP
\fB::ftp::NList\fR \fIhandle\fR ?\fIdirectory\fR?
This command has the same behavior as the \fB::ftp::List\fR command,
except that it only retrieves an abbreviated listing\&. This means only
file names are returned in a sorted list\&.
.TP
\fB::ftp::FileSize\fR \fIhandle\fR \fIfile\fR
This command returns the size of the specified \fIfile\fR on the ftp
server\&. If the command fails an empty string is returned\&.
.sp
\fIATTENTION!\fR It will not work properly when in ascii mode and
is not supported by all ftp server implementations\&.
.TP
\fB::ftp::ModTime\fR \fIhandle\fR \fIfile\fR
This command retrieves the time of the last modification of the
\fIfile\fR on the ftp server as a system dependent integer value in
seconds or an empty string if an error occurred\&. Use the built-in
command \fBclock\fR to convert the retrieves value into other formats\&.
.TP
\fB::ftp::Delete\fR \fIhandle\fR \fIfile\fR
This command deletes the specified \fIfile\fR on the ftp server\&. The
command returns 1 if the specified file was successfully deleted or 0
if it failed\&.
.TP
\fB::ftp::Rename\fR \fIhandle\fR \fIfrom\fR \fIto\fR
This command renames the file \fIfrom\fR in the current directory of
the ftp server to the specified new file name \fIto\fR\&. This new file
name must not be the same as any existing subdirectory or file name\&.
The command returns 1 if the specified file was successfully renamed
or 0 if it failed\&.
.TP
\fB::ftp::Put\fR \fIhandle\fR (\fIlocal\fR | -data \fIdata\fR | -channel \fIchan\fR) ?\fIremote\fR?
This command transfers a local file \fIlocal\fR to a remote file
\fIremote\fR on the ftp server\&. If the file parameters passed to the
command do not fully qualified path names the command will use the
current directory on local and remote host\&. If the remote file name is
unspecified, the server will use the name of the local file as the
name of the remote file\&. The command returns 1 to indicate a successful
transfer and 0 in the case of a failure\&.
.sp
If \fB-data\fR \fIdata\fR is specified instead of a local file, the
system will not transfer a file, but the \fIdata\fR passed into it\&. In
this case the name of the remote file has to be specified\&.
.sp
If \fB-channel\fR \fIchan\fR is specified instead of a local file,
the system will not transfer a file, but read the contents of the
channel \fIchan\fR and write this to the remote file\&. In this case the
name of the remote file has to be specified\&. After the transfer
\fIchan\fR will be closed\&.
.TP
\fB::ftp::Append\fR \fIhandle\fR (\fIlocal\fR | -data \fIdata\fR | -channel \fIchan\fR) ?\fIremote\fR?
This command behaves like \fB::ftp::Puts\fR, but appends the
transfered information to the remote file\&. If the file did not exist
on the server it will be created\&.
.TP
\fB::ftp::Get\fR \fIhandle\fR \fIremote\fR ?(\fIlocal\fR | -variable \fIvarname\fR | -channel \fIchan\fR)?
This command retrieves a remote file \fIremote\fR on the ftp server
and stores its contents into the local file \fIlocal\fR\&. If the file
parameters passed to the command are not fully qualified path names
the command will use the current directory on local and remote
host\&. If the local file name is unspecified, the server will use the
name of the remote file as the name of the local file\&. The command
returns 1 to indicate a successful transfer and 0 in the case of a
failure\&. The command will throw an error if the directory the file
\fIlocal\fR is to be placed in does not exist\&.
.sp
If \fB-variable\fR \fIvarname\fR is specified, the system will
store the retrieved data into the variable \fIvarname\fR instead of a
file\&.
.sp
If \fB-channel\fR \fIchan\fR is specified, the system will write
the retrieved data into the channel \fIchan\fR instead of a file\&. The
system will \fInot\fR close \fIchan\fR after the transfer, this is
the responsibility of the caller to \fB::ftp::Get\fR\&.
.TP
\fB::ftp::Reget\fR \fIhandle\fR \fIremote\fR ?\fIlocal\fR? ?\fIfrom\fR? ?\fIto\fR?
This command behaves like \fB::ftp::Get\fR, except that if local file
\fIlocal\fR exists and is smaller than remote file \fIremote\fR, the
local file is presumed to be a partially transferred copy of the
remote file and the transfer is continued from the apparent point of
failure\&.  The command will throw an error if the directory the file
\fIlocal\fR is to be placed in does not exist\&. This command is useful
when transferring very large files over networks that tend to drop
connections\&.
.sp
Specifying the additional byte offsets \fIfrom\fR and \fIto\fR will
cause the command to change its behaviour and to download exactly the
specified slice of the remote file\&. This mode is possible only if a
local destination is explicitly provided\&. Omission of \fIto\fR leads
to downloading till the end of the file\&.
.TP
\fB::ftp::Newer\fR \fIhandle\fR \fIremote\fR ?\fIlocal\fR?
This command behaves like \fB::ftp::Get\fR, except that it retrieves
the remote file only if the modification time of the remote file is
more recent than the file on the local system\&. If the file does not
exist on the local system, the remote file is considered newer\&. The
command will throw an error if the directory the file \fIlocal\fR is
to be placed in does not exist\&.
.TP
\fB::ftp::MkDir\fR \fIhandle\fR \fIdirectory\fR
This command creates the specified \fIdirectory\fR on the ftp
server\&. If the specified path is relative the new directory will be
created as a subdirectory of the current working directory\&. Else the
created directory will have the specified path name\&. The command
returns 1 to indicate a successful creation of the directory and 0 in
the case of a failure\&.
.TP
\fB::ftp::RmDir\fR \fIhandle\fR \fIdirectory\fR
This command removes the specified directory on the ftp server\&. The
remote directory has to be empty or the command will fail\&. The command
returns 1 to indicate a successful removal of the directory and 0 in
the case of a failure\&.
.TP
\fB::ftp::Quote\fR \fIhandle\fR \fIarg1\fR \fIarg2\fR \fI\&.\&.\&.\fR
This command is used to send an arbitrary ftp command to the
server\&. It cannot be used to obtain a directory listing or for
transferring files\&. It is included to allow an application to execute
commands on the ftp server which are not provided by this package\&.
The arguments are sent verbatim, i\&.e\&. as is, with no changes\&.
.sp
In contrast to the other commands in this package this command will
not parse the response it got from the ftp server but return it
verbatim to the caller\&.
.TP
\fB::ftp::DisplayMsg\fR \fIhandle\fR \fImsg\fR ?\fIstate\fR?
This command is used by the package itself to show the different
messages from the ftp sessions\&. The package itself declares this
command very simple, writing the messages to \fBstdout\fR (if
\fB::ftp::VERBOSE\fR was set, see below) and throwing tcl errors for
error messages\&. It is the responsibility of the application to
overwrite it as needed\&. A state variable for different states assigned
to different colors is recommended by the author\&. The package
\fBlog\fR is useful for this\&.
.TP
\fB::ftp::VERBOSE\fR
A state variable controlling the output of the package\&. Setting
\fB::ftp::VERBOSE\fR to "1" forces the package to show all responses
from a remote server\&. The default value is "0"\&.
.TP
\fB::ftp::DEBUG\fR
A state variable controlling the output of ftp\&. Setting
\fB::ftp::DEBUG\fR to "1" enables debugging and forces the package to
show all return codes, states, state changes and "real" ftp
commands\&. The default value is "0"\&.
.PP
.SH BUGS
.PP
The correct execution of many commands depends upon the proper
behavior by the remote server, network and router configuration\&.
.PP
An update command placed in the procedure \fB::ftp::DisplayMsg\fR may
run into persistent errors or infinite loops\&. The solution to this
problem is to use \fBupdate idletasks\fR instead of \fBupdate\fR\&.
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIftp\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH "SEE ALSO"
ftpd, mime, pop3, smtp
.SH KEYWORDS
ftp, internet, net, rfc 959
.SH CATEGORY
Networking
